Alright, let's work through 3489 times 5983 step by step
3489 × 5983 = 5983 × (3489)
+ 5983 × 9 giving us 53847
+ 5983 × 80 that results in 478640
+ 5983 × 400 yielding 2393200
+ 5983 × 3000 that results in 17949000

= 20874687
